Maybe an event like this will spur some people into... not doing that? Yes I'm aware of the ubiquitous nature of whatsapp in many developing nations. Have also successfully got a lot of people moved onto using Signal for anything they care about.
Signal has and will go down just like facebook.
Cloudflare/aws having issues affects an insanely high percentage of the internet. People still use them.
Outages rarely cause anything, they happen, people move on.